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Fabrication of phytic acid embellished kaolinite and its effect on the flame retardancy and thermal stability of ethylene vinyl acetate composites
Author(s) -
Zhang Huimin,
Meng Dan,
Wang Wenjia,
Li Hongfei,
Gu Xiaoyu,
Zhang Sheng,
Sun Jun,
Xin Fei,
Qin Zuodong,
Tang Wufei
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51364
Subject(s) - limiting oxygen index , intumescent , fire retardant , ethylene vinyl acetate , char , materials science , composite material , phosphoric acid , thermal stability , flammability , charring , ammonium polyphosphate , nuclear chemistry , polymer chemistry , chemical engineering , pyrolysis , polymer , chemistry , copolymer , engineering , metallurgy
A modified kaolinite by grafting with phytic acid (PA‐g‐Kaol) is fabricated, and it was introduced into ethylene vinyl acetate (EVA) with intumescent flame retardancy (IFR) together to improve the flame retardancy of EVA composites. The results show the limiting oxygen index value of EVA/ (18.0 wt% IFR)/ (2.0 wt% PA‐g‐Kaol) is 30.8%. Meanwhile, there is only one dripping produced in the vertical burning test. What's more, the flame‐retardant mechanism is demonstrated by TG‐IR, real‐time‐IR and GC–MS analysis. The results indicate that some pyrolytic products of IFR and PA‐g‐Kaol, like ammonia and phosphoric acid, catalyze the crosslinking of EVA and flame retardant, the resultant compact char protects the substrate from further burning.